OFBSLF: Your anxieties are easy to understand, considering how often CNN and other tv channels re-play the attacks over and over again-watching it has become an obsession with many people.
1) One suggestion is for all of us to watch mostly other shows on the boob tube, or go to Blockbuster and rent videos, if no cable tv available or good old Time-Warner cable reception get erratic, as is usually the case here.
2)The other is to consider how many people are maimed or killed every day in their car. My car was "totaled" (luckily the insurance companies agreed on this) in July by somebody who hit us in the rear at 30+ mph-we had stopped for the last minute with the left turn blinker on, while waiting for a left turn.
3) Consider the very likely possibility that the traveling public will never again allow any group of self-righteous "holy-warriors", no matter what they threaten, to force all pilots from the cockpit controls in any airplane and cooperate quietly for a while. We could never again, as a profession, allow anyone to force both of us out, no matter what they do to anyone in the cabin.
This type of crime might be unlikely to repeat itself, especially with much-improved intelligence staffing.
Good luck on the roads and highways. The cemeteries are full of car accident victims: death is death, unless someone knows how to come back.